用超速试验滑阀作超速试验时,拔出手柄的插销()使二次脉动油升高。
A.向下压手柄
B.向上提手柄
C.顺时针旋转手柄
D.逆时针旋转手柄
参考答案:C
Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.
A.is equal to
B.equal
C.equals to
D.is equal
储存种子,什么样的条件有利于延长种子的寿命?[ ]
A.高温、潮湿
B.高温、干燥
C.低温、潮湿
D.低温、干燥